workflow/node_modules/@antv/x6/es/registry/background/flip-xy.js

export const flipXY = function (img) {
    // d b
    // q p
    const canvas = document.createElement('canvas');
    const width = img.width;
    const height = img.height;
    canvas.width = 2 * width;
    canvas.height = 2 * height;
    const ctx = canvas.getContext('2d');
    // top-left image
    ctx.drawImage(img, 0, 0, width, height);
    // xy-flipped bottom-right image
    ctx.setTransform(-1, 0, 0, -1, canvas.width, canvas.height);
    ctx.drawImage(img, 0, 0, width, height);
    // x-flipped top-right image
    ctx.setTransform(-1, 0, 0, 1, canvas.width, 0);
    ctx.drawImage(img, 0, 0, width, height);
    // y-flipped bottom-left image
    ctx.setTransform(1, 0, 0, -1, 0, canvas.height);
    ctx.drawImage(img, 0, 0, width, height);
    return canvas;
};
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